Valve for gas-pumps.



R. WHITAKER. VALVE FOR GAS PUMPS. APPLICATION FILED NOV. 5, 1906.

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" R. WHITAKER.

ALVE FOR (ms PUMPS. APELIOATION FILED NOV. 5, 1906.

- Patented Sept. 29, 1908.

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- area of ecpiillbrium surface is increased end valve cover, 4 the crown of the valve cover, the cross-heed, and b, 6 the bolts Wi'llCh ,inder, as is disclosed in my co-pend1ng zip licetion before identified' The jOllit-S be ow unrrn srrns liICHARD WHITAKER, OF NEW BRUNSWICK, NEW JERSEY, ASSlG-XUB, TO THE BRUNSWICK liEFltlGERi-lTING COMPANY, A CORPORATION OF NEW JERSEY.

VALVE FOR GAS-PUMPS:

Specification of Letters Patent.

Patented Sept. 29, 1908.

Application filed November 5, 1906. Serial No. 342,055.

To (ZZZ whom it may concern:

Be it known the-t1, RICHARD l/Vnrruimnr, a citizen of the United States of America, residing at New Brunswick, county of Middlesex, State of New Jersey, have invented an improvement in. Valves for Gus-Pumps, of which the following is a, specification.

This invention, relates to improvements in valves for gas pumps, particularly for pumps used in connection with the ammonia com,- pression refrigerating apparatus.

The invention is a modification of the Volvo shown in my application Serial No. 1886M filed January 11, 1904.

the present invention, aduplex valve 5. a. one i.r. which the inlet valve is carried by the outlet valve) is used, in which the the size 0 the spring is very much reduced.

The inven on particularly applicable to pumps oi small size, it permits the rod or spindle of the outlet valve to be made of the smallest size, thereby securing a large equilibrium surface and permitting a small seating spring.

I attain the objects of my invention by the mechnnism shown in the accompanying drawings, in which Figure 3 is sectional view of a pump em bodying; my invention, Fig. is an enlarged view, in section, of the valve, Fig. 3 is c View of parts of the valve before they are assenn bled.

in the drawings like certs are designated by the .eme reference 0 iaraioters.

In Fig. 1 is shown a pump similar to that of ruvepplicetion for patent before referred to, except for the valve.

1 i the crank casing, 2, the cylinder, 3 the clamp the crown 4 upon the cover 3 and hold the cylinder 2 111 piece upon the crank casing end the valve cover 3 in place upon the cylthe top of the cylinder cndvelve cover and valve cover and crown are made with concentric grooves, which effectually prevent leakage and serve as concentric condensing elements if leakage should occur. A gss inlet tube 542 extends through the crown +2 to the gas chamber formed therein erid said chcn'iber is in communication with the hollow spindle of the inlet valve hereinafter referred to.

The core of the cylinder 2 is provided with. an enlargement forming an equilibrium chamber 7. At the base of the chamber is a shoulder which forms the valve seat 8. The outlet valve 9 is within the equilibrium chembe! and rests upon the valve seat 8. The

valve has an integral s )indle 10 which is sun rounded by a so nimble spindle 11, which is provided with a h upon the up )8! surface of the outlet valve. o The side of the outletvulve is provided with on annular groove which communicates with a draw-off pi )e 51, as shown. The joint between the valve and the sides of the chamber is not aclose one, but on. the contrar is sufficiently free to permit the pessage 0 gas into the equilibrium chamber above the valve.

Within the integral s indlc 10 is the inlet valve 12, which inlet V21 ve has a hollow spin dle, constituting a passage which communicates with ports or openings 13 adjacent to its base. The inlet valve is seated by means of a spring 14, and a nut 15 engages with the spring. This Jringlies within an annular re? upon the upper port of the reduced portion 17 and a smaller reduced '85 portion 18. The reduced portion 17 is of sucha. size as to freely slide within an opening 19 in the valve cover 3. The opening 19 .com-

munica-tes with. 8; smaller opening 20, which is of such it size as to permit the reduced pore 99 tion 18 to freely slide within it, The npper port of the chamber 19, where it communi cates with the chamber 20 is squared oil. in

order to form n shoulder 21. The spindle 11 of the outlet valve has a central opening which is preferably the same size as the center openin; oi the inlet valve 12. Thcwalls of the in need portion/18cm made thick enough in order to possess sufficient strength,

but are preferably nuu'le no thicker than is necessar Means is provided for preventing leakegev from the chamber 7 around the reduced porden 18. This means consists preferably of the urchin shown, which comprises a soft rubber was nor 22, which washer lies within the chamber 19 and is forced against the shoulder 21 by the pressure within the chem.-

ange at its base which rests 65 i her 7. The lower face of the washer is preterably con -a.ve, tornung annular lips 23, .34.

The Washer is preferably ot larger diameter than the diameter of the chamber 1!), and the central opening within the washer is preterably of smaller size than the reduced portion 18 of the outlet valve spindle. The proportions of the parts are shown in Fig. 3. In assembling the device, the washer 22 is compressed and crowded into the' chamber '19, so that it abuts against the shoulder 2-1. The spindle 18'is then crowded through the central opening of the washer so that it is compressed against the walls of the chamber 19 and against the spindle 18, so that it will assume the form shown in Fig. 2.

The annular lips 23, 24 will etlectually prevent leakage around the washer. The elasticity of the washer is sullicient to permit the necessary up-and-down movement of the outlet valve spindle in order to permit the opening and closing of this valve. This movement, in practice, will seldom exceed five one-thousandths of an inch.

The outlet valve is seated by means of a spring 25 which lies within the equilibrium chamber 7 and bears against the under surface of the valve cover 3, and the flange of the base of the' separable valve stem 11. This e'l'lectually closes the joint between the valve and the removable stem and prevents leakage at that point. The areav of equilibrium surface is very large, as it is equal to the surface of the valve minus the small area occupied by the spindle 18. This spindle, as already pointed out, need be no larger than. necessary to carry the passage to the inlet valve and hence may be very small. By utilizing this construction, the size of the spring is reduced and it is possible to etl'ectually seat the valve even when the pump is used for compressing gas under very high pressures.

The valve is readily taken apart by slacking up on the nuts or bolts 6, lifting the crosshead and disengaging the crown 4 from engagement with the cover 3. Upon lifting t b cover, the removable spindle will be taken out with it, leaving the rest of the outlet valve with the inlet valve within the equi' librium chamber. These may be readily removed.

It will be understood that the invention is not limited to the details shown, as the outlet valve could be made without the separable spindle by changing the. construction of the inlet valve. l urtliermoro, the packing around the stem 01' the outlet valve eouldbe ditlcrent l'rom that shown, and could comprise ordinary piston rod packingset up with a gland, as is shown ininy (o-pending application bel'orc referred to.

By this invention, an outlet valve of the same diameter as the piston may be used, with an inlet valve nearlv as l:t1'ge.; i' ci)iisequently the movement of the valves is small, and the dead space between the piston and valves is reduced to a m-inimunn This type of valve is materially better for compressing gas under high pressure than those in which the outlet'and inlet valves are separate.

Cross-roterence is made to my application Serial Number 239,724 tiled January 5, 1905 (Patent No. 866,832, dated September 24-, ltltfil which was divided out of my aptdicat'ion Serial Number 188,612 filed January I], ltltl-t and describes a casing having an equilibriuin chamber and a duplex valve, the conslructioir ditl'ering from the construction herein claimed however in that the construetion shown in said application involved an inlet valve whose spindle extended outside of the equilibrium chamber and did not n'esent an outlet valve having the innei aml outer spindles of this application. or the features cooperating therewith.

in accordance with the provisions of the. patent statutes, 1 have described the prin-- ciple of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but l desire to have it understood that the apparatus shown merely illustrative and that the invention can be carried out in other ways.

Having now particularly described my invention, and in what manner the same is to be performed, I declare that what l: claim, and desire to secure by Letters Patent, is:

1. In a duplex valve, the combination with a casing having an equilibrium chamber, an outlet valve and an inlet valve. carried thereby, the outlet valve spindle only extending outside of the equilibrium chamber.

2. A valve for gas pumps comprising a casing haviin an equilibrium chamber, an outlet valve raving an inner and an outer spindle, the outer spindle having a reduced ortion which extends outside of the equilibrium chamber, and an inlet valve carried by the outlet valve.

3. A duplex valve for gas pumps comprising a casing having an equilibrium chamber,

a. gas inlet chamber separated by a wall from said equilibrium chamber, an outlet valve whose spindle extends through an openine in said wall, a soit rubber washer surrotmoing said spindle to prevent leakage around the same out of said. equilibrium elntuibor. and an inlet valve carried by said outlet valve.

4. A duplex valve. for gas umps comprising a casing having an equili irium ehamlm-r, a gas inlet chamber separated by a wall from said equilibrium chamber, an outlet valve Whose spindle extends through an opening in aid wait, a soft rubber was ier :nirrounding said spindle to prevent leakage around the same out or" said equilibrium chamber, and an inlet valve carried by said outlet valve,

said spindle 0t thei utlet valve being of relif l said spindle of the outlet valve being of re-. duced diameter Where it passes through said duced diameter where it passes through said opening and said packing beingcompressed in place'and expanded over thespindle.

5. A duplex'valve for gas umps comprising a casing having an equili riumchamber', a gas inlet chamber separated by a wall from said equilibrium chamber, an outlet valve whose sfiindle extends throu h an openin in said wa a soft rubber was er surroun ing said spindle to reventleakage around the same out of said equilibrium chamber, and an inlet valve carried by said outlet valve,

opening and said packing being'com ressed in place and expanded over the spin le and having annular lips engaging the s indle and the Wall of the e uilibrium chain er.

6. A duplex va ve for gas pumps comprising a casing having an equilibrium chamber and a valve seat, an outlet valve adapted to said seat and having an inner hollow spin-' dle and an outer encompassing spindle .fianged to engage the upper surface of said valve and havin areduced u per portion extending througli a wall-of sai chamber, a spring engaging at its lower end said flange of said va ve spindle and-iit its upper end the upper wall of said chamber, an nlet valve carried by said outlet valve, a spring for .seating said inlet valve, and a packing for l the upper portion of the outer spindle of said outlet valve.

ing a casing having an equili rium chamber, a valve seat and a cover having a lower opening 19) and an upper opening (20) of smaller diameter and concentric therewith, an outlet valve adapted to said seat and having an inner hollow spindle and an outer encom passing spindle flanged to engage the upper surface of said valve and havin a reduced portion to enter and uide in said ower o en- ,mg and a further reduced portion exten mg through said upper opening, a spring'engaging at its lower end said flange of said valve inlet valve carried y said outlet valve, a spring for seating said inlet valve, and a packthe outlet valve,

This specification signed and witnessed this 31st day of October, 1906.

. RICHARD WHITAKEIL, Witnesses:

EDWARD MORRIS, J. L. CARBERRY.

7. A duplex valve for gas pumps compris ingln the up er end of said lower openin for theupper re uced end of said outer spindle ofspindle and at its u per end said cover, an 

